题目

It is human nature to think back to a golden age ______ one’s country was strong and respected. A. if               B. when               C. while             D. after 答案：B 【解析】考查状语从句的连接词。句意：当一个国家强盛和受到尊敬的时候，回忆过去的黄金时代是人类的天性。

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